Fixes cursor hiding bug

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
index 527a9ca9f50705bde700c4d142677828ad5e94ee..652b81aaaeb7f8c6149fdf10b1b76b576a55d586 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
@@ -64,7 +64,8 @@ DesktopRootWindowHostWin::DesktopRootWindowHostWin(
       should_animate_window_close_(false),
       pending_close_(false),
       has_non_client_view_(false),
-      tooltip_(NULL) {
+      tooltip_(NULL),
+      is_cursor_visible_(true) {
 }
 
 DesktopRootWindowHostWin::~DesktopRootWindowHostWin() {
@@ -488,6 +489,9 @@ void DesktopRootWindowHostWin::UnConfineCursor() {
 }
 
 void DesktopRootWindowHostWin::OnCursorVisibilityChanged(bool show) {
+  if (is_cursor_visible_ == show)
+    return;
+  is_cursor_visible_ = show;
   ::ShowCursor(!!show);
 }